Molding press



April 21,- 1931. R. L. sEABURY MOLDING PRES S Filed Nov. 4, 1927 Patented Apr. 21, 1931 errno STATES PATENT FFICE RALPH L. SEABURY, OF TOLEDO, OHO, ASSIGNOR TO DELCO-REIYIY CORPDRATO'N, AGIF ANDERSN, IN'DANA, A CORPORATON 0F DELAVARE MOLDING .PRESS Application filed November 4, 1927. Serial No. 230,959.

This invention relates to presses for compressing or compacting granular powders into a firm, hard and compact mass, as tor example, compressing metallic particles int a solid mass to produce` a brush for electrical purposes.

Gbjects of this invention are to produce a press for compacting powdered or granular material capable of effecting a deiinite predetermined pressure irrespective of the distance the pressure member travels into the mold cavity; and to provide a press of the above type which is constructed to hold the pressure member in advanced position during a portion of the upward travel ot the crank,

thereby retaining the pressure member in eX- tended engagement with the material to secure most etiicient compacting. Other objects and advantages will appear as the description proceeds.

rlhe invention is shown by way of illustration in the accompanying drawings, in which The figure is a side elevation of a press embodying the invention.

Reference is hereby made to my copending application Serial Number 121,112, filed July 8th, 1926, issued Oct. 16, 1928, to Patent 1,687 ,995 entitled Press for molding granular powders, and of which this application fis a continuation in part.

The illustrated embodiment of the invention comprises a press frame 27, which is substantially E-shaped, and is provided with a rotating table 28 formed with mold cavities 29, in which the material is compacted. An ejector punch 30 is mechanically operated through arms 31 and 32 by a crank 33 on the driving wheel 34. The driving wheel 34 may be operated from any suitable source of power, as for example, an electric motor.

A pressure punch 35 is vertically reciprocable through the frame 27, and is eXtensible into a cavity 29 in the table 28, an abutment 36 on the frame providing a shoe against which the punch operates. Concomitant with the compression or compacting ot an article, a previously formed article is ejected by the punch 30 at a point spaced or opposed from the point of compression. y In this manner as material is being compressed into a compact mass by the plunger 85, the ejector' 30 is at the same time being extended into another cavity to discharge a previously compacted mass.

In order to reciprocate the pressure punch 35, toggle means is employed in the form of pivotally connected links 37 and 38, the former being pivoted at one end to the pressure punch 35, and the link 38 being pivoted to piston or abutment plunger 40. The joint of the toggle is connected 'by a linkr 39 to the crank pin 33.

The piston or abutment plunger 40 is movable within a Vcylinder 41 forming a part oi' a passage 42 leading to an accumulator cylinder 43.' The accumulator cylinder 43 is spaced from the cylinder 41, and is vertically disposed, a piston 44 being' disposed within thecylinder 4B and having its outer end positioned on the outside of the cylinder. Removable weights 45 are placed on the piston 44, and the number thereof'ma-y be varied in accordance with the pressure desired, it being understood that whenV the pressure exerted by the toggle on the abut ment plunger 40 exceeds a predetermined maximum the piston 44 is elevated to relieve Vthe excessive pressure, and eliminate liability of damage to the parts.

In operation, the movementot the crank 38 opens the toggle through the connecting link 89 and the punch 35 is forcibly pressed toward the shoe 36, thereby causing the powdery material, previously fed to a cavity 29, to be cempressed. Since one member' of the toggle is connected to the abutment plunger 40, the pressure developed by the pressure plunger 35 will always be the same, regardless of the quantity of powder introduced into a mold cavity. By means ot the weighted piston 44 the pressure plunger 35 is maintained in compressing operation or caused to dwell during a portion of the upward travel ot the crank pin 33 so that after the material is compacted, the pressure plunger will not be retracted with such quickness as to disrupt the piece.

lVhile l have shown and described my improved press in more or less detail to comply with the requirements of the statute, it is,

nevertheless, desired that this detailed description be considered merely as illustrative and not as limiting, and it is to be understood that changes in modification may be made by those skilled in this art without departing from the invention, especially as deined in the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. A press comprising a trame, a table rotatable on said frame, a plunger reciprocable in said frame and into said table, a toggle connected at one end to said plunger, power means operable against the toggle joint, an abutment plunger for the opposite end of said toggle, and a constant pressure fluid means including a weighted vertical piston and cylinder for opposing movement of said abutment plunger.

2. A press comprising a frame, a rotatable table, a plunger reciprocable in and out of said table and carried by said frame, toggle means connected at one end to said plunger, means yieldingly resisting movement of the opposite end of the toggle with a constant predetermined force and including a vertically disposed weighted piston and pressuie fluid between said piston and toggle, and ejecting means spaced from said plunger operable concomitantly therewith.

3. A molding press for briquetting powdered material under high pressure, comprising: a mold and plunger therefor, a hydraulic piston directly aligned with said plunger, a toggle connecting said plunger and hydraulic piston, power means operable against said toggle and aided by the direct action of said hydraulic piston to force said plunger to highly compress powdered material in said mold.

4. A molding press for briquetting powdered material under high pressure, comprising: a mold and plunger therefor, a hydraulic piston directly aligned with said plunger, a toggle connecting said plunger and hydraulic piston, power means operable against said Y toggle and aided by the direct action of said hydraulic piston to force said plunger to highly compress powdered material in said mold, and a vertical hydraulic cylinder and weighted piston therein supplying a constant hydraulic pressure upon said hydraulic piston during said forcing action.

In testimony whereof l have hereunto signed my name to this specification.

RALPH L. SEABURY. 

